100次浏览 发布时间:2023-07-02 13:15:23
幼树主要以营养生长为主,主要目的在于促进其生长,使得幼树的树冠快速成长,让幼树尽快的投产,由于幼树根系比较脆弱,吸收能力有限,施肥时不宜大肥大水,建议以少量多次施肥为主,幼树施肥一次不能施用过多,但幼树快速生长期又需肥较多。
一般推荐是一次梢施肥2-3次,或者每月施肥一次,根据柑橘生长规律,一般施肥主要以春夏秋季为主,冬季不建议施肥,以免引发冬梢,冬梢冬梢后容易引起溃疡病等病害泛滥 。
施肥主要以速效氮肥为主,也可以使用腐熟的花生麸液肥+氮肥来施用,如果长势不够好,建议使用海精灵生物刺激剂+氮肥施用,适合柑橘幼树平常使用,也适合柑橘僵苗、黄化、根系不良等情况,也是一次梢淋是2-3次。
除了根部施肥,我们还可以新梢老熟80%后喷施磷钾源库等促进新梢老熟,秋冬季可以开沟施入冬肥,冬肥以腐熟的有机肥为主,如果土壤比较贫,可以加入一些中微量元素和复合肥等,有机肥需要腐熟后使用,鸡粪之类更是要用活土君发酵王等腐熟完全后备用。
一般是采用环状沟施,挖浅沟施肥后适当覆土,滴水线(树冠最外边下部)处开沟,不建议直接撒施施肥,直接撒施肥料在土表面,肥料利用率低,且容易造成根系上浮,根系具有向肥性,如果长期撒施肥料,可能会导致根系较浅。
幼树生长较快,为了快速扩大树冠,所以不宜重剪,可以在每次放梢前将一些零星芽剪除,树冠除强去弱,中下部除弱留强。树冠增大后,去掉下部的扫地枝。
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